Electronic Document Verification via Sequential Barcode Capture
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Solution Overview
Problem
Conventional two-dimensional barcodes, such as QR codes, have limited storage capacity, making them unsuitable for electronic documents like passports or driving licenses that contain large data, including photographs, which exceed the storage capacity of current barcode versions.
Innovation Solution
A method and device that capture and decode a sequence of two-dimensional barcodes displayed successively, using a public key to verify the validity of the electronic document, allowing for the transmission of electronic documents with signatures without a telecommunication network, and enabling verification of the document's validity in any situation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional two-dimensional barcode is used to represent electronic document data, then the barcode can be decoded quickly, but the storage capacity is limited and cannot accommodate large data such as photographs
Solution Approach 1:
The electronic document data is divided into multiple segments, each represented by a separate two-dimensional barcode. The system captures a sequence of barcodes instead of a single barcode, allowing large data volumes to be distributed across multiple code units that can be decoded and reassembled
Solution Approach 2:
The solution transitions from a single two-dimensional barcode to a temporal sequence of multiple barcodes. By adding the time dimension to the display and capture process, the system effectively increases the information capacity while maintaining the simplicity of individual barcode structures
2Quantity of substance
If multiple two-dimensional barcodes are displayed successively to increase storage capacity, then large data can be transmitted, but the capture and decoding process becomes more complex
Solution Approach 1:
The system activates the image-capture device before the barcode sequence is displayed and continues activation after display completes. This preliminary and extended capture activation ensures all barcodes in the sequence are captured without requiring complex real-time detection logic
Solution Approach 2:
Instead of requiring complex real-time decoding of moving barcodes, the system captures static images of each barcode in the sequence and performs decoding after capture. This separates the capture phase from the processing phase, simplifying the overall system requirements
3Reliability
If each two-dimensional barcode is captured multiple times to ensure reliability, then capture reliability increases, but the time required for verification increases
Solution Approach 1:
The system merges multiple captured images into a single verification process. By capturing barcodes multiple times and combining the results, the system ensures reliable data collection while performing the verification operation efficiently in a unified step
Data Source
AI summary
A method and device for verifying the validity of an electronic document is provided. A device for capturing images and capturing a sequence of images displayed by a device for presenting the electronic document is activated. The sequence of images may include different two-dimensional barcodes displayed successively one after the other, where the two-dimensional barcodes represent a signature of the electronic document and parts of the electronic document. The two-dimensional barcodes are decoded, and the validity of the signature is verified by means of a public key. A message representing the result of the verification is generated.